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Evi Aprianti
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International Association of Lowland Technology In Collaboration with Hasanuddin University and Saga University Address Faculty of Engineering, Center of Technology Building, 1st Floor Jalan Poros Malino km. 6, Bontomarannu, Gowa Indonesia Postal Code: 91711
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Lowland Technology International
Published by International Association of Lowland Technology
ISSN : 13449656     EISSN : 21878870     DOI : https://doi.org/10.0001/ialt_lti
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
The Lowland Technology International Journal presents activity and research developments in Geotechnical Engineering, Water Resources Engineering, Structural Engineering, Transportation Engineering, Urban Planning, Coastal Engineering, Disaster Prevention and Mitigation Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 463 Documents
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An early warning monitoring of Earthquake-induced slope failures by monitoring inclination changes in multi-point tilt sensors L. Wang; S. Nishie; L. Su; H. Yamaguchi; S. Yamamoto; T. Uchimura; S.N. Tao
Lowland Technology International Vol 19 No 4, March (2018)
Publisher : International Association of Lowland Technology

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Abstract

An early warning monitoring system is one of the most effective ways to reduce disasters induced by slope instability. The 2016 Ms 7.3 Kumamoto earthquake, which occurred in Kumamoto prefecture, Japan, induced more than 190 large scales of slope failures (123), debris flows (57) and landslides (10). A system of distributed tilt sensors for early warning monitoring of earthquake-induced landslides and slope failures has been proposed. Tilt angles in the surface layer of a slope were monitored using this method and, in several case studies, distinct behaviors in tilt angles in pre-failure stages were detected. Based on this behavior, it is recommended, from a regulatory perspective, a precaution be issued when the tilting rate of a slope is 0.01°/h, and a warning be issued when the tilting rate is 0.1°/h.
Restoration of damaged stone walls of Kumamoto castle due to the 2016 Kumamoto Earthquake M. Fukuda
Lowland Technology International Vol 19 No 4, March (2018)
Publisher : International Association of Lowland Technology

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Abstract

The 2017 Kumamoto earthquake caused damages to many stone walls of Kumamoto castle. Paper shows facing curves of deformed or collapsed stone walls can be interpreted comparing with the traditional guideline contributed to the stone piling technique. Reconstruction works are aimed to return the collapsed stone wall to the original features. The original curve of stone wall is possibly evaluated at the remained stone wall adding the existing measurement data. There were many deformed stone wall of Kumamoto castle before the 2016 Kumamoto earthquake. The stone wall is congenitally fragile to deform. Deformation level is evaluated comparing the deformed curve of stone wall and the traditional stone piling guidelinel. Stability analysis of stone wall should include deflected facings of stone wall. Paper shows the role of depth of stone wall on the base of thin skeleton model of stability analysis.
Investigation of slopes on the Takanoobane lava dome using the resistivity imaging method Y. Kochi; T. Kariya; D. Matsumoto; T. Hirose; H. Hazarika
Lowland Technology International Vol 19 No 4, March (2018)
Publisher : International Association of Lowland Technology

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Abstract

In the Kumamoto earthquake in 2016, landslides occurred in many place on moderately inclined slope in the Takanoobane lava dome. In this research, we focus on the orange-colored pumice layer (Kpfa), which is predisposed to the landslide, and show the distribution using the resistivity imaging method on a slope where no landslide has occurred. According to the survey results, the slope without the landslide was observed when the slope was hard to slip mechanically due to the Kpfa layer was distributed in a shallow place or paleogeography of the foundation layer surface (Takanoobane lava)
Geotechnical extreme-event reconnaissance (GEER) investigation to the 2016 Mw6.0, Mw6.2and Mw7.0 Kumamoto Japan Earthquakes R. Kayen; T. Kokusho; H. Hazarika; S. Dashti; J. R. Calderon; T. K. Franke; N. K. Oettle; B. Wham; G.P. Louis-Kayen; R. Sitar; N.M. Louis-Kayen
Lowland Technology International Vol 19 No 4, March (2018)
Publisher : International Association of Lowland Technology

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Abstract

The Kumamoto, Kyushu, Japan earthquakes began with an earthquake (M6.2) on the Hinagu Fault on April 14, 2016 followed by a second (M7.0) event on the Futagawa Fault, that on April 16. These shallow 10-11 deep km events are the strongest earthquakes recorded in Kyushu prefecture during the modern instrumental era. The United States’ National Science Foundation (US NSF) supported Geotechnical Extreme Events Reconnaissance (GEER) Association conducted a reconnaissance of the region. These earthquakes resulted in substantial damage to infrastructure, buildings, cultural heritage of Kumamoto castle, roads and highways, slopes, and river embankments. Surface fault rupture produced offset to roads, buildings, river levees, and an agricultural dam. Surprisingly, given the extremely intense earthquake motions, liquefaction-induced damage was mostly limited to a few districts of Kumamoto City and in port areas, indicating that either the volcanic soils were largely unsusceptible to liquefaction or the presence of fines reduced the surficial manifestation of liquefaction and its effects. The important case histories identified by the study are [1] fault rupture through OhKirihata Dam; [2] subsidence in Aso Caldera; [3] fault rupture through Shimojin-Cho River Canal; [4] surprising paucity of liquefaction and its effects; and [5] possible identification of a nearly non-displacement lateral spread.
THE DSS 'PLANNING KIT' AND ITS APPLICATION IN THE SPANKRACHT* STUDY A.G. Kors
Lowland Technology International Vol 6 No 2, Dec (2004)
Publisher : International Association of Lowland Technology

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Abstract

The Netherlands is expected to face severe consequences of climate change. A rise of the average sea level with 60 cm and increase with about 20% of the extreme discharges of the rivers Rhine and Meuse might be expected ad the end of this century. This requires measures. Therefore a policy analyses has been carried out to determine which strategy could be followed to maintain the current safety satndards. In this policy analyses about three hundred spatial measures were evaluated. To support the work a Decision Support System has been developed: the Planning Kit. This article presents the Planning Kit and ilustrates working with the Planning Kit. In the Spankracht study the Planning Kit proved to be an indispensable instrument in the evaluation process.
RESEARCH FRAMEWORK ON THE SUITABLE DEVELOPMENT MODEL AND MECHANISM OF GREEN STTLEMENT IN THE YANGTZE RIVER DELTA Z. Wang; Y. He; J. Ge
Lowland Technology International Vol 6 No 2, Dec (2004)
Publisher : International Association of Lowland Technology

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Abstract

By selecting a breakthrough point from the Green Settlement of towns and cities in the Yangtze river delta, which is of great significance to the sustainable development strategy for human sttlement in China, this research tries to integrate the enduring regional "genes" of settlement, to explore the external character and internal law of the basic urban residential unit, and grasp its controlling/adjustment mechanisms. On this base, detailed goals, evaluation systems, space/form modelsand suitable technologies of sustainable development are expected to be established. Thus, the sustainable development strategy for human sttlement in that region can be promoted and serve as a guide for China as a whole.
The The Study on Age-Friendly Environments for an Improvement of Quality of Life for Elderly, Asian Mega City, Thailand P. Iamtrakul; S. Chayphong; J. Klaylee
Lowland Technology International Vol 21 No 2, Sep (2019)
Publisher : International Association of Lowland Technology

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Abstract

With the global trends of urbanization and aging population, more focus about the design of age-friendly environments to improve quality of life for our residents aged of 60 years and more is increasing. The pursuit of healthy, productive, and purposeful aging must become a priority for all communities, especially in Asian megacity, Thailand. In order to enable living environment for older people as a resource for their families, communities and economies, the complex infrastructure and social context must be unfolded. Thus, this study attempted to understand the health related problem of age groups among difference life styles and neighborhood characteristics toward the appropriate recommendation of an age-friendly city by conducting the site investigation together with questionnaire survey. The total 1,000 sets of older people were interviewed by working closely with authorities from Banpaew district of Samutsakorn Province, Thailand. By adopt the technique of focus groups among caregivers and service providers in the public, voluntary and private sectors, the in-depth interview could be executed and comprehended. The results from the focus groups led to a guideline development for age-friendly city improvement. Finally, an ultimate aim of recommendation for longevity urban environment could be promoted to encourage active ageing by optimizing opportunities for health, participation and security in order to enhance quality of life.
Mechanical and hydrological time-dependent properties of granulated blast furnace slag-sand mixture in soft ground improvement T. Sakata; N. Yasufuku; R. Ishikura; A. Alowaisy
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Every year about 20 million tons of Granulated Blast Furnace Slag (GBFS) are produced as a manufacturing byproduct. GBFS is mainly utilized in cement production accounting for 70% of the total utilized weight, while the geotechnical engineering applications accounts for 2%. Therefore, finding innovative utilization methods is a necessity. It was reported that the GBFS can be used as substitutive material in sand compaction pile (SCP) method. This study aims at evaluating the time-dependent mechanical, hydrological and chemical properties of the GBFS and the GBFS-sand mixtures. It was found that for early hydration stage, the hydrological and mechanical properties of the GBFS depends on the microstructure of the material, while the generation of the calcium silicate hydrate can be neglected. On the other hand, for longer curing time the influence of the calcium hydrate silicate generation becomes significant. Finally, it was concluded that mixing the GBFS with sand is a simple efficient way to control the time dependent mechanical, hydrological and chemical properties of the GBFS, however, the combined effect of the hydration reaction rate and the void ratio developments in response to the mixing ratio and the curing time should be properly considered to optimize utilizing the GBFS.
Effect of cations on consolidation and permeability of polymerized bentonite N. Prongmanee; J.C. Chai; S. Shrestha
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Properties of a novel material “polymerized bentonite (PB)” and a traditional untreated bentonite (UB) were investigated through two series of laboratory tests (i.e., consolidation test and filter press test). Three different test liquids included of deionized water, 0.6 M NaCl and 0.6 M CaCl2 were used in this study. The results of consolidation tests indicated that the compression index (Cc) and swelling index (Cs) decreased, while the coefficient of consolidation (cv) increased with the increasing in concentration and valence of cation in the solutions. Comparison between two materials in the cationic solutions, the PB had higher Cc and Cs value, but it gave lower cv value compared with that of the UB. The results of estimated permeability (kfilter) from the test results of the filter press showed that the PB gave lower values of kfilter for all the test solutions compared with those of the corresponding UB due to the polymer “locked” Na+ ions carried by the bentonite particles and partially prevented it to be replaced by higher cation charge. Based on the results of permeability, it is suggested that the PB can provide better barrier properties against aggressive cationic solutions compared to that of the UB.
The form of street spatial layout based on a wind environmental perspective X.Y. Ying; Q. Kan; G. Ding
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

With China's rapid urbanization, the construction of central areas in city with numerous buildings and dense population has greatly changed the microclimate. Different street spatial layouts change the internal wind environment, which affect the pedestrian comfort. Computational fluid dynamics (CFD) models are used to study the correlation between the three-main street spatial layout factors, which are near-line rate, street interface density and street aspect ratio, under the simulation of relevant weather conditions. Firstly, the wind speed within the street change with the increase of the near-line rate like a parabola trend, and the wind speed reaches its peak about at a near-line rate of 70%. In that case, it’s conducive to ventilation. Secondly, with the reduction of street interface density the variation of the wind speed of each measuring point in the streets is getting bigger and bigger, and the pedestrian walking in them will feel the change of wind speed which makes the comfort of pedestrian decrease. Thirdly, the average wind speed in urban streets is inversely proportional to the street aspect ratio. These conclusions will provide an important reference and evaluation basis for urban designers at the beginning of design and effectively avoid future wind environment problems.

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